Paper drinking cup



Dec. 27, 192 7;

W. E. BENSON PAPER DRINKING CUP Filed Jan. 22. 1925 'nven ior WILLIAM EEIENSEIN Abytamed Deana, 1?:21'1

r .UNITED STATES PATENT oF-nce.

WILLIAM E. BENSON, OF WILMINGTON, MASSACHUSETTS, ASSIGNOR TO KALIX CUP COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

rn'rnn nrmrxrneour.

ori inal application filed October 1c, 1922, serial No. 594,775.-'Divii1ed ant-m. application filed January 22, 1923.

lhis invention relates to waterproofed paper receptacles, and particularlyto paper drinking cups of the type wherein the bottom closure is a separate piece sealed to the wall of the cup.

My present invention is a d1v1s10n of my prior application, Ser al No. 594,77 5, filed October 16, 1922, covering the method of and apparatus for producing my novel cup.

claimed specifically herem.

, One characteristic difficulty 1n the production of cups of this type in commerclal quantities consists in the union of the bottom closure to thecup wall. This is 'of necessity the area of greatest weakness-1n this type of cup,-and is usually united 2y coating the contacting surfaces of the bla and closure with glue or paraffin and pressing them-together to seal them.

One object of my present invention is to provide a, cup in which the contacting surfaces of theseparts will be positively pressed together and worked relatlve to each other in such manner as to cause them to firmly adhere to each other.

vide a closure which will not open up when 3d at substantially the same angle as the flaring cup wall itself but is reversed relative there- 7 to. This leaves a. space between the on wall fiange'and the'wall itself within whic the flange of the bottom closure snuglyseats,

cup wall against the flan e of sa1d bottom closure after the cup wal and closure have been scaled together. 'A further object of my invention is to provide acup which will instantly indicate whether or not it, has'been previously used. According to my invention, the cup wall may be made of transparent paper stock, therebyj permitting the internal seam or overlap of Inasmuch as said seam wil hold moisture,

the prospective drinker can immediately de-.

Another object of my inventionis to pro-- and actually increases the pressure of the said coated edge. the cup to be viewed 'throu h the cup wall;

Serial No. 614,082.

will have inwardly rolled beads or rims at 6 fltheir upper edgesand such rims will prevent the 'cups from nesting too closely together by reason of the reduction in effective diameter of the cups at their upper edges. With the outwardly rolled bead or with the plain edge cup, the cups nest snugly within each other with the head of one resting upon the bead of the c'upnext below in the column, and hence frequently stick together and come out in groups when withdrawn from the dispensing machine.

These objects and various other features of advantage which will appear more particularly hereinafter, aresecured in the cup of the present invention.

The construction of my cup is described and illustrated in the accompanying specification and drawings, throughout which like reference characters are employed to indicate corresponding parts, and the characteristic features of novelty are particularly pointed out in the appended claims.

In the drawings:

Fig. 1 is a view of a paper, drinking cup' in accordance with my invention. 7

Fig. 2 is a vertical section thereof. Fig. 3'is a view of the bottom closure, detached, and p r Fig. 4: is a partial section particularly'illustratin the angular relation of the cup 90 wall to t e flange thereof. e I

lnthe type of cup selected herein as illustrative of the principles involvedflhe. cup

blank is dinked out of transparent paper stock, if desired, in an ordinary dinkin or stamping press, glued alon one vertica edge and then rolled upon a orming mandrel to lap its oppositevertical edge over At this stage, the blank is formed to cup shape, as indicated at 1 in the drawings, but has not been bent at its bottom edge to provide the. closure attaching'flange 2 or rolledat its top edge to provide the inturned head or rim- 3, Fig. 1. As here shown, the cup blank is cut on a curve so as to flare up- I wardly from bottom to top when rolled to cup form.

After the cup blank isrolled to form, it is transferred to a forming and sealing ma- 110 chine where the bottom closure t is united,

thereto.

The closures 4: are first blanked out of a strip of suitable material and the flanges '5 simultaneously formed thereon." The next step consists in applyin glue to the inner faces of said flanges, a or which the side wall of the cup is bent u wardly to form the flange 2 which is folde over the flange 5 of the bottom closure, The flanges 5 and 2 are next worked relative to each other to after which the cup with bottom attached cause them to firmly adhere to each other,

is tripped fromthe machine and the bead 3 'formed thereon, it ahead is desired, suchbead being. rolled either inwardly or outwardly as desired. 3

-5 of the bottom piece 4, and the cup notv therefore open up when filled. The

Wherefparafin is usedinstead of lue, the gluing step is omitted and the para is applied by the. same mechanism which works the flanges 5 and 2 together.

The included angle at the fflan e- 2 is preferably of substantially the same degree as-the an le-oi flare of the side wall '1 ofthe cup, utis reversed thereto, as indicated at Fig. 4. This increases the strength of the cup at its bottomby increasin the pressure of the cup wall. against the an 1? spacement of the flange 2-from the cup wall,

moreover, affords a seat for the free edge of the flange 5 of the bottom piece 4. In other words, vthe flanges 2 and 5 contact with each other in a plane which is disposed out of the vertical and hence these flanges can be sealed to each other immediately after vantage. It is furthermore to be'note'd that they have been coated with adhesive by bringing a 'dovrnwardl 'exerted pressure against them toforce t em tightly against each other thereby making a water tight joint at the bottom of the cup. Unless relativel great pressure is applied to these flanges irectly after they have been glued and joined together, the joint cannot be relied .on during succeeding operations in making-the on even if the next operation is only that o gently ejecting the finished cup from the machine. A very slight move ment of the flexible paper unless great pressure has been used in joining the two anges will break the cohesion of the flanges and the cup will leak. Of course, if light pressure were used and the on s were al' owed to stand in the press or a short time, it is probable that the glue would set -suflicientl to permit the cup to be moved without reaking, but such a delay slows up manufacture and the use of a stron vertical pressure is therefore of great a while the flange 2 bein reversed at the same angle to the vertica as the side wall is a smooth flange, the flange 5 of the closure ,flangeinterengaging with said wall horizontal-is a somewhat crinkled or corrugated flange. By pressing this corrugated flange 5 tightly in 'contactwith the smooth flange 2, a reinforced flange of great strength is formed. This coupled with the fact that thebottom and flange form a low which. has been crimped down from the eg truncated cone, makes-a structure of very great strength, especially when reinforced by the liquid contents of the cup which surrounds the flanges.

Where the cup blank is of transparent paper stock the internal seam S or overlap 7 S3. cure by Letters Patent is 1. In a paper vessel, an outwardly flaring I side wall and a bottom, said Well and hottomv having corresponding inwardflanges of positive mclmatlon bearlng each on the.

other and united each to the other to form of the bottom and seam a vsubstantially frustro conic element with the seam of an angularlty-reversed to that of the side wall and internally divergent therefrom to leave an internal channel.

.2. In an inserted bottom .paper cup or the like, a bottom seam composed of hot-- tom and side wall flanges adhesively united each tothe other and so disposed as to rovide a V-shaped channel between the umted.

flanges and the cup Wall. j

3. A paper receptacle comprising a side wall having an-inwardly'and upwardly disposed flange, a bottom closure of less diame ter thanthe adjacent receptacle wall and havin a flange engaged with and fitting the wall ange and cemented thereto and leaving one face of the combined flanges freely exposed to-fluid pressure of the receptacle when in use.

4. A paper receptacle comprising aside wall having an inwardly and upwardly turned bottom flange, and a bottom closure member having ,a downwardly dis osed an e said flanges both being disposed at an angld to the axis of the receptacle so as to be inclined away from the side wall.

In testimony whereof I 'affix my signature.

WILLIAM E. BENSON. 

